Calculate the number 2126

A man walked into a bar, sat down, ordered 3 shots of whiskey, drank them, then left. This continued daily for several weeks.

Curious, the bartender asked him one day, "Why do you always order three shots of whiskey?"

The man answered, "Because my two brothers and I always used to have one shot each, and since they've both passed on, I've continued to order the three shots in their honor."

The bartender thought that this was a very noble thing to do, and welcomed the man every time he visited the bar.

Two weeks later, the man walked into the bar for his daily visit and ordered two shots of whiskey. Surprised, the bartender asked him why he only ordered two when had had always been ordering three.

The man answered, "Oh, I've decided to stop drinking."